US4427612A - Method for sealing an electrical component, particularly a relay - Google Patents

Method for sealing an electrical component, particularly a relay Download PDF

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Publication number
US4427612A
US4427612A US06/335,585 US33558581A US4427612A US 4427612 A US4427612 A US 4427612A US 33558581 A US33558581 A US 33558581A US 4427612 A US4427612 A US 4427612A
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US
United States
Prior art keywords
fleece
stamp
housing
fleece layer
sealed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/335,585
Other languages
English (en)
Inventor
Cornelia Albert
Ulf Rauterberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Assigned to SIEMENS AKTIENGESELLSCHAFT, A GERMAN CORP. reassignment SIEMENS AKTIENGESELLSCHAFT, A GERMAN CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ALBERT, CORNELIA, RAUTERBERG, ULF
Application granted granted Critical
Publication of US4427612A publication Critical patent/US4427612A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/023—Details concerning sealing, e.g. sealing casing with resin
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings

Definitions

  • the invention relates to a method for the sealing of an electrical component, particularly a relay, comprising a housing exhibiting individual apertures or joints.
  • a fleece i.e. a tissue or non woven fabric covering having a high capillary absorption capacity, is placed over the housing apertures to be sealed.
  • This fleece is subsequently impregnated with a low-viscosity, age-hardenable casting resin.
  • a method of this type is known from U.S. Pat. No. 4,176,241. It is essentially employed for the purpose of sealing the housing apertures for connecting pins and the housing joints between a base and a protective cap. With the use of fleece, it is possible to effectively distribute a small quantity of casting resin over the entire surface and, in particular, to convey it to the housing aperatures without thus contaminating the projecting connecting pins and without significantly increasing the overall height of a relay or of a similar component.
  • the fleece lie in a planar fashion on the housing surface to be sealed, particularly also at the edges, since otherwise unsealed locations can occur.
  • a frame be placed on the fleece so as to weight the fleece at the edges until the age-hardening of the casting resin occurs.
  • these frames must consist of a special material, for example polytetrafluoroethylene, in order to avoid an adhesion of the casting resin on the frame.
  • a large number of these costly frames must be available; moreover, the latter must be cleansed after each use in order to be able to be further used.
  • this object is achieved in that the fleece, immediately prior to the application of the casting resin, is pressed on the component with a heated stamp which is matched to the component surface.
  • the fleece is already smoothened prior to application of the resin.
  • This resin provides a good and tight connection with the component surface at all locations; and even after the age-hardening, the fleece retains a smooth surface.
  • the stamp for the purpose of contact-pressing the fleece does, indeed, represent an additional device in the fabrication. However, it represents a substantially lower expense than the method of first bringing the relay into a magazine, fitting it with a cover frame, and later again separating these cover frames. Such a frame, of course, must be available for all production units during the entire age-hardening time. They must also be prepared for each new one.
  • the inventively employed pressing stamp can be readily integrated in an automated production line.
  • the temperature of the stamp is selected, in dependence upon the material of the fleece, and such that the fleece is smoothened through a brief contact-pressure.
  • conventional fleece materials such as synthetic wool or polyester fibers
  • temperatures of approximately 200° C. are selected.
  • fleece materials can also be employed which on account of their tendency toward wave formation or buckling, could previously not be used, such as for example, polyester.
  • thermoplastic housing material such that the housing surface is molten and becomes cemented together with the fleece.
  • temperatures of approximately 240° C. are selected.
  • the fleece covers larger free areas, it can also be expedient to provide the fleece beginning with slots from the edge in order to prevent a later removal of the fleece in every instance.
  • the fleece prior to pressing-on of the stamp, is impregnated with a small quantity of a solvent which attacks the housing material.
  • the housing surface is somewhat dissolved and, upon pressing-on of the stamp, becomes cemented together with the fleece. It can suffice to apply the solvent only at a few locations, preferably in the marginal region of the housing.
  • the capillary effect of the fleece is already utilized in this case prior to the introduction of the casting resin for the distribution of the solvent.
  • the solvent can, for example, be applied on the fleece through openings of the stamp.
  • the advantage of this method lies primarily in that, for the stamp, a substantially lower temperature than in the case of the above-cited methods can be selected; for example, a stamp temperature of approximately 40° C. suffices. This is important in the case of very thin-walled housings which could become warped or deformed at high stamp temperatures.
  • the solvent can be applied directly on the fleece, for example through openings in the stamp.
  • conventional solvents are employed, such as for example, trichloroethene, perchloroethene, acetone, or methylene chloride. Since, through a large-area adhesion of the fleece its capillary effect could be impaired, the flow of the casting resin from a filling location to remote housing edges can be improved by means of additional grooves in the housing surface. This can be of an advantage in the case of large housing surfaces which are to be sealed, such that from a filling location, the casting resin then first travels via individual channels beneath the fleece and reaches the remote edges, and is there distributed from the channels through the fleece over the entire surface.
  • FIG. 1 illustrates an apparatus for the contact-pressing of the fleece with a heated stamp
  • FIG. 2 illustrates an apparatus with additional solvent supply.
  • a component 1 for example a relay, is illustrated with a housing cap 2 (partially sectioned) and a base 3 through which connection pins 4 are guided toward the exterior.
  • the housing thus exhibits joints 5 between the housing cap 2 and the base 3 as well as aperture 6 in the base for the connections 4, which are to be commonly sealed with a fleece 7 and with casting resin.
  • the component 1 is transported on a transport frame 8 under a heated stamp 9 which is briefly pressed perpendicularly onto the fleece.
  • This stamp 9 is precisely matched to the component surface. It thus possesses, for example, recesses 10 for the connection pins 4. Also, graduations of the component surface which may possibly be present, and which are not illustrated here, are taken into consideration through corresponding matching of the stamp surface, so that the fleece 7 is uniformly pressed onto the component surface and smoothened by means of the heated stamp.
  • the temperature of the stamp can be so selected that the component surface is readily molten and cemented together with the fleece. It could be sufficient here that, for example, only the edge of the cap 2 is cemented all around together with the fleece 7.
  • FIG. 2 illustrates a somewhat modified embodiment.
  • the component 1, as in FIG. 1, possesses a cap 2 and a base 3 whose housing openings are covered with the fleece 7.
  • a heated stamp 11 is employed which additionally exhibits a channel system 12 with openings 13 in the direction of the contact-pressure side.
  • solvent in small dosing can be brought onto the fleece 7 in order to slightly dissolve the surface of the component and to cement it together with the fleece 7.
  • the solvent can be introduced shortly before or while the stamp is being securely pressed onto the fleece.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cable Accessories (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Casings For Electric Apparatus (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Contacts (AREA)
  • Insulating Bodies (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Motor Or Generator Frames (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
US06/335,585 1981-02-20 1981-12-29 Method for sealing an electrical component, particularly a relay Expired - Fee Related US4427612A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813106371 DE3106371A1 (de) 1981-02-20 1981-02-20 Verfahren zur abdichtung eines elektrischen bauelementes, insbesondere eines relais
DE3106371 1981-02-20

Publications (1)

Publication Number Publication Date
US4427612A true US4427612A (en) 1984-01-24

Family

ID=6125374

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/335,585 Expired - Fee Related US4427612A (en) 1981-02-20 1981-12-29 Method for sealing an electrical component, particularly a relay

Country Status (7)

Country Link
US (1) US4427612A (fr)
EP (1) EP0058757B1 (fr)
JP (1) JPS57152632A (fr)
AT (1) ATE9190T1 (fr)
BR (1) BR8200921A (fr)
DE (2) DE3106371A1 (fr)
PT (1) PT74465B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4975545A (en) * 1988-07-20 1990-12-04 Wickes Manufacturing Company Sealed relay assembly
DE9215176U1 (de) * 1992-11-07 1992-12-24 Meteor Gummiwerke K. H. Bädje GmbH & Co, 31167 Bockenem Sicherheitsprofilstück mit Kontaktbändern

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2216752B1 (fr) * 1973-02-02 1979-01-12 Toko Inc
DE2616299C2 (de) * 1976-04-13 1978-04-27 Siemens Ag, 1000 Berlin Und 8000 Muenchen Waschdichte Schutzvorrichtung für ein elektromechanisches Bauelement und Verfahren zu dessen Abdichtung
DE2618492C2 (de) * 1976-04-27 1984-03-22 Siemens Ag, 1000 Berlin Und 8000 Muenchen Waschdichte Schutzvorrichtung für ein elektromechanisches Bauelement
DE2710211A1 (de) * 1977-03-09 1978-09-14 Licentia Gmbh Verfahren zur herstellung von vergossenen elektrischen schaltungen mit zugaenglichen bauteilen

Also Published As

Publication number Publication date
EP0058757B1 (fr) 1984-08-29
PT74465A (de) 1982-03-01
BR8200921A (pt) 1982-12-28
EP0058757A1 (fr) 1982-09-01
ATE9190T1 (de) 1984-09-15
DE3106371A1 (de) 1982-09-09
DE3165792D1 (en) 1984-10-04
JPS57152632A (en) 1982-09-21
PT74465B (de) 1983-08-19

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Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362